Preoperative ultrasound to map the three-dimensional anatomical distribution of the lateral femoral cutaneous nerve in direct anterior approach for total hip arthroplasty

Table.3 Rate of LFCN injury, sensory disturbance area, and Harris scores at 1 and 3 months after operation in the ultrasound and control groups

	Ultrasound group			Control group			P_preop t_preop	P₁ t₁/χ²₁	P₃ t₃/χ²₃
	Preop	1 month	3 months	Preop	1 month	3 months	P_preop t_preop	P₁ t₁/χ²₁	P₃ t₃/χ²₃
LFCN injury	0	2 (3.4%)	2 (3.4%)	0	15 (25.9%)	13 (22.4%)	–	0.001 χ²₁ = 11.893	0.005 χ²₃ = 9.471
Area (cm²)	0	39.0 ± 4.2 (36.0–42.0)	39.0 ± 4.2 (36.0–42.0)	0	133.1 ± 104.9 (49.0–375.0)	132.7 ± 112.9 (49–375.0)	–	< 0.001 t₁ = 4.048	0.002 t₃ = 4.139
Harris score	22.9 ± 14.7 (0–48)	79.6 ± 3.5 (72–85)	89.6 ± 3.4 (82–95)	24.2 ± 15.1 (0–51)	80.0 ± 3.7 (72–86)	90.0 ± 3.8 (84–96)	0.640 0.468	0.517 t₁ = 0.651	0.518 t₃ = 0.649
Time of operation		84.8 ± 5.5			82.2 ± 5.2			0.638 t = 2.670

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